(n) a midwestern state in central United States; a border state during the American Civil War, Missouri was admitted to the Confederacy without actually seceding from the Union, Syn. MO, Show Me State
(n) the longest river in the United States; arises in Montana and flows southeastward to become a tributary of the Mississippi at Saint Louis, Syn. Missouri River, Example:The Missouri and Mississippi Rivers together form the third longest river in the world